基于单元结构填土模型试验确定累积变形状态阈值的方法

The Method to Determinethe Threshold of Cumulative Deformation State Based on the Element Model Test

设计了一套利用单元填土模型试验确定累积变形状态阈值的方法。通过有限元计算确定主要受力区作为模型填土空间,以砖墙和砂袋组合形成模型填土非完全侧限边界约束,结合变形测试和循环加载设备构成试验系统。在填土空间内填筑相应压实状态的模型进行循环加载试验,获得累积变形随加载次数的变化曲线,运用"幂次判别法"确定循环荷载作用下累积变形演化状态阈值。选用级配碎石填料进行循环加载试验,验证了基于单元填土模型试验确定累积变形状态阈值的可行性。

A set of test method which uses the element model to determine the threshold of accumulated deformation state was designed. The size of model filling space was confirmed based on the main stressed area which was calculated hy the FEM. The brick wall and sand pockets constitute the boundary o{ the model. In addition, the test system also included the equipment of deformation and cyclic loading. The curves d the accumulated deformation changing with the load time were obtained by the cyclic loading test to the model filled at predetermined compaction factor, and then the threshold of accumulated deformation state was corffirmed using the method of ＂Power Law＂. The graded broken test shows that the method for obtaining the accumulated deformation state threshold based on the element model experiment is feasible.